Exhaust blowing/vibration

[His Dudeness]

It shouldn't come out around that join but if it does it won't have any major effect apart from a bit of extra noise. Just for a laugh hold a rag over the end of the exhaust can and give the engine a rev. There'll be water flying out of that drain hole. It's nothing to worry about. If it really bothers you get another can there's loads of them for sale, you'd probably get a good used one cheap.